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Date: Sat, 19 May 2018 00:01:24 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Rishabh Bhatnagar <rishabhb@...eaurora.org>
Cc: linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
linux-arm-msm@...r.kernel.org,
devicetree <devicetree@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-arm@...ts.infradead.org, tsoni@...eaurora.org,
ckadabi@...eaurora.org, evgreen@...omium.org,
Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v7 2/2] drivers: soc: Add LLCC driver
On Wed, May 16, 2018 at 8:43 PM, Rishabh Bhatnagar
<rishabhb@...eaurora.org> wrote:
> LLCC (Last Level Cache Controller) provides additional cache memory
> in the system. LLCC is partitioned into multiple slices and each
> slice gets its own priority, size, ID and other config parameters.
> LLCC driver programs these parameters for each slice. Clients that
> are assigned to use LLCC need to get information such size & ID of the
> slice they get and activate or deactivate the slice as needed. LLCC driver
> provides API for the clients to perform these operations.
> +static const struct of_device_id sdm845_qcom_llcc_of_match[] = {
> + { .compatible = "qcom,sdm845-llcc", },
> + { },
Slightly better w/o comma
> +};
> +static struct platform_driver sdm845_qcom_llcc_driver = {
> + .driver = {
> + .name = "sdm845-llcc",
> + .owner = THIS_MODULE,
No need. See below.
> + .of_match_table = sdm845_qcom_llcc_of_match,
> + },
> + .probe = sdm845_qcom_llcc_probe,
> +};
> +
> +static int __init sdm845_init_qcom_llcc_init(void)
> +{
> + return platform_driver_register(&sdm845_qcom_llcc_driver);
> +}
> +module_init(sdm845_init_qcom_llcc_init);
> +
> +static void __exit sdm845_exit_qcom_llcc_exit(void)
> +{
> + platform_driver_unregister(&sdm845_qcom_llcc_driver);
> +}
> +module_exit(sdm845_exit_qcom_llcc_exit);
Why not to use module_platform_driver() macro?
> +#define ACTIVATE 0x1
> +#define DEACTIVATE 0x2
> +#define ACT_CTRL_OPCODE_ACTIVATE 0x1
> +#define ACT_CTRL_OPCODE_DEACTIVATE 0x2
> +#define ACT_CTRL_ACT_TRIG 0x1
Are these bits? Perhaps BIT() ?
> +#define ACT_CTRL_OPCODE_SHIFT 0x1
> +#define ATTR1_PROBE_TARGET_WAYS_SHIFT 0x2
> +#define ATTR1_FIXED_SIZE_SHIFT 0x3
> +#define ATTR1_PRIORITY_SHIFT 0x4
> +#define ATTR1_MAX_CAP_SHIFT 0x10
Better to use fixed size pattern, i.e. 0x01, 0x02, 0x03, 0x04, 0x10.
> +#define ATTR0_RES_WAYS_MASK 0x00000fff
> +#define ATTR0_BONUS_WAYS_MASK 0x0fff0000
GENMASK()
> +#define LLCC_LB_CNT_MASK 0xf0000000
Ditto.
> +#define MAX_CAP_TO_BYTES(n) (n * 1024)
(n * SZ_1K) ?
> +#define LLCC_TRP_ACT_CTRLn(n) (n * 0x1000)
SZ_4K ?
> +#define LLCC_TRP_STATUSn(n) (4 + n * 0x1000)
Ditto.
> +struct llcc_slice_desc *llcc_slice_getd(u32 uid)
> +{
> + const struct llcc_slice_config *cfg;
> + struct llcc_slice_desc *desc;
> + u32 sz, count = 0;
> +
> + cfg = drv_data->cfg;
> + sz = drv_data->cfg_size;
> +
> + while (cfg && count < sz) {
> + if (cfg->usecase_id == uid)
> + break;
> + cfg++;
> + count++;
> + }
> + if (cfg == NULL || count == sz)
> + return ERR_PTR(-ENODEV);
if (!cfg)
return ERR_PTR(-ENODEV);
while (cfg->... != uid) {
cfg++;
count++;
}
if (count == sz)
return ...
Though I would rather put it to for () loop.
> +static int llcc_update_act_ctrl(u32 sid,
> + u32 act_ctrl_reg_val, u32 status)
> +{
> + u32 act_ctrl_reg;
> + u32 status_reg;
> + u32 slice_status;
> + int ret = 0;
Useless assignment. Check entire patch series for a such.
> + ret = regmap_read_poll_timeout(drv_data->regmap, status_reg,
> + slice_status, !(slice_status & status), 0, LLCC_STATUS_READ_DELAY);
Wrong indentation.
> + return ret;
> +}
> + ret = llcc_update_act_ctrl(desc->slice_id, act_ctrl_val,
> + DEACTIVATE);
Perhaps one line (~83 characters here is OK) ?
> + ret = llcc_update_act_ctrl(desc->slice_id, act_ctrl_val,
> + ACTIVATE);
Ditto.
> + attr1_cfg = bcast_off +
> + LLCC_TRP_ATTR1_CFGn(llcc_table[i].slice_id);
> + attr0_cfg = bcast_off +
> + LLCC_TRP_ATTR0_CFGn(llcc_table[i].slice_id);
Ditto.
> + attr1_val |= llcc_table[i].probe_target_ways <<
> + ATTR1_PROBE_TARGET_WAYS_SHIFT;
> + attr1_val |= llcc_table[i].fixed_size <<
> + ATTR1_FIXED_SIZE_SHIFT;
> + attr1_val |= llcc_table[i].priority << ATTR1_PRIORITY_SHIFT;
foo |=
bar << SHIFT;
would look slightly better.
> +int qcom_llcc_probe(struct platform_device *pdev,
> + const struct llcc_slice_config *llcc_cfg, u32 sz)
> +{
> + drv_data->offsets = devm_kzalloc(dev, num_banks * sizeof(u32),
> + GFP_KERNEL);
> + if (!drv_data->offsets)
> + return -ENOMEM;
devm_kcalloc() ?
> +
> + for (i = 0; i < num_banks; i++)
> + drv_data->offsets[i] = (i * BANK_OFFSET_STRIDE);
Pointless parens.
> + drv_data->bitmap = devm_kcalloc(dev,
> + BITS_TO_LONGS(drv_data->max_slices), sizeof(unsigned long),
> + GFP_KERNEL);
> + if (!drv_data->bitmap)
> + return -ENOMEM;
Perhaps at some point someone will add
bitmap_alloc()
devm_bitmap_alloc()
> + bitmap_zero(drv_data->bitmap, drv_data->max_slices);
Pointless
--
With Best Regards,
Andy Shevchenko
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